Simple approvals would be a fair start. i.e. Is this ticket approved to work on, because it's actually a service request... New ID's, new PC or whatever...
I'm still waiting for more dispatching rules. i.e. Assign this ticket to an asset automatically for example...
Technically you can use an external email forms system to send tickets into the helpdesk on submission, that could then trigger workflow (dispatch) actions upon receipt...
Just sharing random a.m. thoughts...